NER Class O

{{Use dmy dates|date=August 2017}}

{{Use British English|date=August 2017}}

{{Infobox locomotive

|powertype=Steam

|name = NER Class O
LNER Class G5

|image = Ex-NER 0-4-4T in Stratford Locomotive Shed yard, 1946 (geograph 4800336).jpg

|caption = Ex-NER 0-4-4T in Stratford Locomotive Shed yard, 1946.

|designer = Wilson Worsdell

|builder =

|builddate = 1894-1901

|totalproduction = 110

|whytetype = 0-4-4T

|gauge = {{track gauge|ussg}}

|driverdiameter = {{convert|5|ft|1.25|in|3|abbr=on}}

|length =

|locoweight = {{convert|54.2|LT|abbr=on}}

|fueltype = coal

|fuelcap =

|watercap =

|cylindercount = two inside

|cylindersize = {{convert|18|x|24|in|abbr=on}}

|firearea =

|boilerpressure = {{convert|160|psi|abbr=on}}

|tractiveeffort = {{convert|17265|lbf|kN|abbr=on}}

|operatorclass=

|withdrawndate = 1950-1958

|disposition = All original locomotives scrapped. One replica being constructed.

}}

The NER Class O (LNER Class G5) was a class of 0-4-4T steam locomotives of the North Eastern Railway,{{cite book| title=Ian Allan ABC of British Railways Locomotives, part 4| edition=1948| page=44}}{{cite web| url=http://www.lner.info/locos/G/g5.shtml| title=The G5 (NER Class O) 0-4-4T Tank Locomotives| website=The London & North Eastern Railway (LNER) Encyclopedia}} designed by the company's Chief Engineer, Wilson Worsdell. They all survived into British Railways ownership in 1948 and their BR numbers were 67240-67349. They were withdrawn between 1950 and 1958.